Signs of cam phaser failure - Ford Mustang Forum
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post #1 of 4 (permalink) Old 03-10-2016 Thread Starter
chwithad's Avatar
Joined: Mar 2014
Location: loudoun county
Posts: 24
Signs of cam phaser failure

What typically goes bad with camshaft phasers? (Besides it completely falling apart) I'm going to take off my drivers valve cover this weekend and inspect the phaser, so I want to know ahead of time what I need to look out for. Thanks.

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post #2 of 4 (permalink) Old 03-10-2016 Thread Starter
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Joined: Mar 2014
Location: loudoun county
Posts: 24
In case I need to replace one of the cam phasers, how dependable is a garden hose going to be instead of the timing chain wedge as far as preventing the chains from moving? The last thing I want to have happen is having a quick 20 minute inspection turning into an entire weekend of resetting the timing.

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post #3 of 4 (permalink) Old 03-10-2016
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A thick rubber fuel line (like 3/8") would work much better than a garden hose. I haven't dealt with phaser issues, so I'm sorry I can't help you out there.

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post #4 of 4 (permalink) Old 03-11-2016
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What goes wrong really depends. 3v motors had several design flaws which can cause a multitude of failures.

The oil pump rear cover fails and this causes low oil pressure. This can cause less pressure up to the top of the motor causing cam journal scoring. It also causes a lack of pressure to the chain tensioners which can result in timing cover damage, broken plastic chain guides, plastic debris in the oil pickup and pan and jumped time..

The original timing chain tensioner had a habit of popping the seal in the back of them causing oil and oil pressure loss. The result is loose chains, jumped time, damaged guides and cam journal scoring.

Since the phasers are at the "end of the line" so to speak. The can be damaged several ways and not necessarily related to the above issues.
Typically, the roll pins holding the trigger wheel on shear, the main pin on the rear of the phaser can also shear. Lack of oil to the phaser due to clogged oil passages, low oil pressure etc, can cause a clacking sound like a diesel makes. But this sound is mostly due to the lack of oil getting into the phasers due to low pressure, low volume, clogged VVT selenoid screens or a bad selenoid. The oil passages related to these components are very small and must be cleaned.
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